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 #include &lt;QtGui&gt;

 #include &quot;mainwindow.h&quot;
 #include &quot;findfiledialog.h&quot;

 MainWindow::MainWindow()
 {
     textViewer = new QTextEdit;
     textViewer-&gt;setReadOnly(true);
     QFile file(&quot;documentation/intro.html&quot;);
     if (file.open(QIODevice::ReadOnly))
         textViewer-&gt;setHtml(file.readAll());

     setCentralWidget(textViewer);

     createActions();
     createMenus();

     initializeAssistant();

     setWindowTitle(tr(&quot;Simple Text Viewer&quot;));
     resize(750, 400);
 }

 void MainWindow::closeEvent(QCloseEvent *)
 {
     if (assistantClient)
         assistantClient-&gt;closeAssistant();
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr(&quot;About Simple Text Viewer&quot;),
                          tr(&quot;This example demonstrates how to use\n&quot; \
                             &quot;Qt Assistant as help system for your\n&quot; \
                             &quot;own application.&quot;));
 }

 void MainWindow::assistant()
 {
     assistantClient-&gt;showPage(QLibraryInfo::location(QLibraryInfo::ExamplesPath) +
                                               QDir::separator() +
                                               &quot;assistant/simpletextviewer/documentation/index.html&quot;);
 }

 void MainWindow::open()
 {
     FindFileDialog dialog(textViewer, assistantClient);
     dialog.exec();
 }

 void MainWindow::createActions()
 {
     assistantAct = new QAction(tr(&quot;Help Contents&quot;), this);
     assistantAct-&gt;setShortcut(tr(&quot;F1&quot;));
     connect(assistantAct, SIGNAL(triggered()), this, SLOT(assistant()));

     openAct = new QAction(tr(&quot;&amp;Open...&quot;), this);
     openAct-&gt;setShortcut(tr(&quot;Ctrl+O&quot;));
     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

     clearAct = new QAction(tr(&quot;&amp;Clear&quot;), this);
     clearAct-&gt;setShortcut(tr(&quot;Ctrl+C&quot;));
     connect(clearAct, SIGNAL(triggered()), textViewer, SLOT(clear()));

     exitAct = new QAction(tr(&quot;E&amp;xit&quot;), this);
     exitAct-&gt;setShortcut(tr(&quot;Ctrl+Q&quot;));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     aboutAct = new QAction(tr(&quot;&amp;About&quot;), this);
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

     aboutQtAct = new QAction(tr(&quot;About &amp;Qt&quot;), this);
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
 }

 void MainWindow::createMenus()
 {
     fileMenu = new QMenu(tr(&quot;&amp;File&quot;), this);
     fileMenu-&gt;addAction(openAct);
     fileMenu-&gt;addAction(clearAct);
     fileMenu-&gt;addSeparator();
     fileMenu-&gt;addAction(exitAct);

     helpMenu = new QMenu(tr(&quot;&amp;Help&quot;), this);
     helpMenu-&gt;addAction(assistantAct);
     helpMenu-&gt;addSeparator();
     helpMenu-&gt;addAction(aboutAct);
     helpMenu-&gt;addAction(aboutQtAct);

     menuBar()-&gt;addMenu(fileMenu);
     menuBar()-&gt;addMenu(helpMenu);
 }

 void MainWindow::initializeAssistant()
 {
     assistantClient = new QAssistantClient(QLibraryInfo::location(QLibraryInfo::BinariesPath), this);

     QStringList arguments;
     arguments &lt;&lt; &quot;-profile&quot; &lt;&lt; QString(&quot;documentation&quot;) + QDir::separator() + QString(&quot;simpletextviewer.adp&quot;);
     assistantClient-&gt;setArguments(arguments);
 }</pre>
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